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Protospacer Workbench offers an interface for finding, evaluating, and sharing Cas9 guide-RNA (gRNA) designs. Our primary goal for the workbench is to provide a flexible environment capable of adapting to all gRNA-design applications for the CRISPR system in all genomes.Your feedback will be appreciated and will help in future development. You can help improve Protospacer by signing up to the mailing list and/or by sending us your comments.